Maurice Thompson-Moore faces four counts of felony firearm, three counts of armed robbery, one count of assault with intent to murder, one count of carrying a dangerous weapon with unlawful intent, and one count of being a felon in possession of a firearm.

Just before 8 p.m. Monday, Thompson-Moore and another man entered the Family Dollar on the 18200 block of Schoolcraft with guns drawn, demanding that a cashier open her register, police said. The area is just west of the Southfield Freeway and north of Davison.

Told that only a manager can open the register, the manager, a 50-year-old Lincoln Park woman, was forced to do so, at which point the suspects stole money from the till, according to a release from the Wayne County Prosecutor's Office.

The robbers also took a 25-year-old woman's wallet at gunpoint.

But the store had security and its security guard emerged from the back, firing shots that hit and killed one of the alleged robbers.

Authorities believe Thompson-Moore left through a side door and shot the security guard before fleeing.

But Thompson-Moore had taken gunfire during the interaction as well, and was arrested when police caught up to him later that hour at a Detroit hospital.

Thompson-Moore's arraignment is expected Thursday at Detroit's 36th District Court.